An open and free bittorrent tracker https://erdgeist.org/gitweb/opentracker
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/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever.
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$id$ */
/* System */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
/* Libowfat */
#include "byte.h"
#include "scan.h"
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#include "ip6.h"
#include "mmap.h"
/* Opentracker */
#include "trackerlogic.h"
#include "ot_accesslist.h"
#include "ot_vector.h"
/* GLOBAL VARIABLES */
#ifdef WANT_ACCESSLIST
char *g_accesslist_filename;
static ot_hash *g_accesslist;
static size_t g_accesslist_size;
static int vector_compare_hash(const void *hash1, const void *hash2 ) {
return memcmp( hash1, hash2, OT_HASH_COMPARE_SIZE );
}
void accesslist_deinit( void ) {
free( g_accesslist );
g_accesslist = 0;
g_accesslist_size = 0;
}
/* Read initial access list */
static void accesslist_readfile( int sig ) {
ot_hash *info_hash, *accesslist_new = NULL, *accesslist_old;
char *map, *map_end, *read_offs;
size_t maplen;
if( sig != SIGHUP ) return;
if( ( map = mmap_read( g_accesslist_filename, &maplen ) ) == NULL ) {
char *wd = getcwd( NULL, 0 );
fprintf( stderr, "Warning: Can't open accesslist file: %s (but will try to create it later, if necessary and possible).\nPWD: %s\n", g_accesslist_filename, wd );
free( wd );
return;
}
/* You need at least 41 bytes to pass an info_hash, make enough room
for the maximum amount of them */
info_hash = accesslist_new = malloc( ( maplen / 41 ) * 20 );
if( !accesslist_new ) {
fprintf( stderr, "Warning: Not enough memory to allocate %zd bytes for accesslist buffer. May succeed later.\n", ( maplen / 41 ) * 20 );
return;
}
/* No use to scan if there's not enough room for another full info_hash */
map_end = map + maplen - 40;
read_offs = map;
/* We do ignore anything that is not of the form "^[:xdigit:]{40}[^:xdigit:].*" */
while( read_offs < map_end ) {
int i;
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for( i=0; i<(int)sizeof(ot_hash); ++i ) {
int eger = 16 * scan_fromhex( read_offs[ 2*i ] ) + scan_fromhex( read_offs[ 1 + 2*i ] );
if( eger < 0 )
continue;
(*info_hash)[i] = eger;
}
read_offs += 40;
/* Append accesslist to accesslist vector */
if( scan_fromhex( *read_offs ) < 0 )
++info_hash;
/* Find start of next line */
while( read_offs < map_end && *(read_offs++) != '\n' );
}
//#ifdef _DEBUG
fprintf( stderr, "Added %d info_hashes to accesslist\n", info_hash - accesslist_new );
//#endif
mmap_unmap( map, maplen);
qsort( accesslist_new, info_hash - accesslist_new, sizeof( *info_hash ), vector_compare_hash );
/* Now exchange the accesslist vector in the least race condition prone way */
g_accesslist_size = 0;
accesslist_old = g_accesslist;
g_accesslist = accesslist_new;
g_accesslist_size = info_hash - accesslist_new;
free( accesslist_old );
}
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int accesslist_hashisvalid( ot_hash hash ) {
void *exactmatch = bsearch( hash, g_accesslist, g_accesslist_size, OT_HASH_COMPARE_SIZE, vector_compare_hash );
#ifdef WANT_ACCESSLIST_BLACK
return exactmatch == NULL;
#else
return exactmatch != NULL;
#endif
}
void accesslist_init( ) {
/* Passing "0" since read_blacklist_file also is SIGHUP handler */
if( g_accesslist_filename ) {
accesslist_readfile( SIGHUP );
signal( SIGHUP, accesslist_readfile );
}
}
#endif
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static ot_ip6 g_adminip_addresses[OT_ADMINIP_MAX];
static ot_permissions g_adminip_permissions[OT_ADMINIP_MAX];
static unsigned int g_adminip_count = 0;
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int accesslist_blessip( ot_ip6 ip, ot_permissions permissions ) {
if( g_adminip_count >= OT_ADMINIP_MAX )
return -1;
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memcpy(g_adminip_addresses + g_adminip_count,ip,sizeof(ot_ip6));
g_adminip_permissions[ g_adminip_count++ ] = permissions;
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#ifdef _DEBUG
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{
char _debug[512];
int off = snprintf( _debug, sizeof(_debug), "Blessing ip address " );
off += fmt_ip6c(_debug+off, ip );
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if( permissions & OT_PERMISSION_MAY_STAT ) off += snprintf( _debug+off, 512-off, " may_fetch_stats" );
if( permissions & OT_PERMISSION_MAY_LIVESYNC ) off += snprintf( _debug+off, 512-off, " may_sync_live" );
if( permissions & OT_PERMISSION_MAY_FULLSCRAPE ) off += snprintf( _debug+off, 512-off, " may_fetch_fullscrapes" );
if( permissions & OT_PERMISSION_MAY_PROXY ) off += snprintf( _debug+off, 512-off, " may_proxy" );
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if( !permissions ) off += snprintf( _debug+off, sizeof(_debug)-off, " nothing\n" );
_debug[off++] = '.';
write( 2, _debug, off );
}
#endif
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return 0;
}
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int accesslist_isblessed( ot_ip6 ip, ot_permissions permissions ) {
unsigned int i;
for( i=0; i<g_adminip_count; ++i )
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if( !memcmp( g_adminip_addresses + i, ip, sizeof(ot_ip6)) && ( g_adminip_permissions[ i ] & permissions ) )
return 1;
return 0;
}
const char *g_version_accesslist_c = "$Source: /home/cvsroot/opentracker/ot_accesslist.c,v $: $Revision: 1.25 $\n";